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Calculate Your Carbs

The key to shedding flab is to adjust your carb intake to your activity level. Men's Health weight-loss advisor Alan Aragon, M.S., has a simple way to calculate how many carbs you need.

Multiply your target body weight by 1 if you have a desk job, work out in a gym several times a week for an hour or less, and your main goal is fat loss. Multiply by 2 if you're a recreational athlete who trains for more than an hour a day. And multiply by 3 if you're a competitive athlete who trains multiple hours a day, or if you're a guy with a Mini Cooper body and a Corvette metabolism who is struggling to gain weight.

The number you end up with indicates how many grams of carbs you should eat every day. If you're in category 1 and weigh 180 pounds, that's the equivalent of about two Chipotle burritos.